Process of making a composite casting of aluminum and another metal



H. B. HTTESHEW. PROCESS OF MAKING A COMPOSITE CASTING 0F ALUMINUM AND ANOTHER METAL.

APPLICATION FILED AUG-3|, 1916.

1,339,956. A Patented May 11,1920.

flvgzm 227.2- %%m UNITED STATES PATENT OFFICE.

HARVEY B. HITESHEW, OF CLEVELAND, OHIO.

PROCESS MAKING A COMPOSITE CASTING- OF ALUMINUM AND ANOTHER Application filed August 31, 1916. Serial No. 117,862.

To all whom it may concern:

Be it known that I, .HARVEY B. HITEsHEW, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Processes of Making a Composite Castingof Aluminum and Another Metal, of which the following is a full, clear, and exact description.

For certain purposes it is very desirable to use a composite casting of aluminum and iron, but so far as I am aware, there has been no practical method proposed by which aluminum could be cast on-a piece of iron which is pre-formed.

There are certain peculiarities about aluminum and its cooling from a molten condition which seem to have heretofore proven substantially impossible to overcome. V

Aluminum when cast over an iron article, tends to chill at the place where it is in contact with the iron, and the result is, as the casting sets, that the aluminum in contact with the iron, splits, thereby producing a practically useless finished article.

It is the purpose and object of this invention to provide a method by which aluminum may be cast upon a pro-formed iron piece, thereby to ,form' a composite cast metal piece of iron and aluminum.

While I have referred to my invention as relating to the casting of iron and aluminum, and will further describe the invention in connection with these two metals, I do'not wish to limit myself particularly to casting aluminum on iron, as the method is practical for steel and probably other metals.

Reference should be had to the accompanying drawings forming a part of this invention, in'which Figure l is a transverse section of a mold with the metal forming the casting therein; Fig. 2 is an elevation with portions in section,.showing one step in the method of my invention; and Fig. 3

isan elevation of a composite cast piston head.

I will explain my invention as it will be carried out in making a cast aluminum piston head, the lower part of which has a skirt which is of cast iron, the cast iron portion and the aluminum portion forming a composite casting.

At 1 is indicated a table which has an opening, indicated at 2. Through this opening the iron skirt portion 3, which is annular, will be placed so that'the lower portion thereof will rest upon the hooks 41 whichare carried by the table 1. The iron ping is thus supported and held in position.

Cooperating with. the skirtportion 3 is a core which is generally represented at 5.

Patented May 11, 1920:

This core is made of the usual material and I of proper form for the casting of the piston head. The core issupported by the iron ring 3, and the core is formed to have a tight fit within the upper part of the ring for this purpose; The ring 3 is formed with a portion of decreased diameter, and is indicated at 6, thereby forming a shoulder 7. The portion 6 .is provided with holes extending therethrough, which are indicated at 8.

When the ring'3 and the core 5 are assembled, as shown in Fig.2 and mounted in the opening in the table 1, there is placed over the core a cope '9. This cope is previously formed in a manner to cooperate with the 'core so that when the metal is introduced into the'mold through the gate 10, a proper castingwill be formed.

Either before the core and ring are mounted in the table, as shown in Fig. 1, or while it is so mounted in the table 1, the ring'3 is heated. I have found that if the ring is heated somewhat below red heat, it will have beenproperly heated for the purpose as later described.

The molten aluminum is then introduced.

through the ate into the mold, and as will be seen from l ig. 1, it flows over the portidn 6 of the iron ring and engages with the shoulder 7, .thus' enveloping a portion of the ring 3. Also there is a certain amount of the metal which flows through the holes 8. A suitable shield or plug of sand or other suitable material will be placed against the holes 8 to prevent the escape of metal therefrom.

As soon asthe moldis .full of metal, the ring 3 is chilled in any desired manner, as

by spraying the same with water. Thismay .strain which might be developed in the aluminum which is cooling in contact with the portion 6 of the iron ring. Therefore, when the metal has solidified and cooled, the iron ring 3 is completely and satisfactorily joined with the piston head. The

metal which has passed through the open-.

ings 8, may be flattened so as to more securely hold the iron ring to the piston head.

It is customary to machine aluminum piston heads after they are cast, to bring them to the proper diameter, and the composite casting produced, as before described, may be machined as a unit, thus insuring that the external diameter of the piston head and of the ring are the same.

tary integral composite cast piston of aluminum and another metal, the said other metal being in form substantially an annular ring, and having a portion which extends within the head, the outer surface of the said ring being substantially flush with the outer surface of the aluminum portion of the piston head.

In testimony whereof I hereunto aflix my signature.

HARVEY B. HITESHEVV. 

